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3x/7-x=21
We move all terms to the left:
3x/7-x-(21)=0
We add all the numbers together, and all the variables
-1x+3x/7-21=0
We multiply all the terms by the denominator
-1x*7+3x-21*7=0
We add all the numbers together, and all the variables
3x-1x*7-147=0
Wy multiply elements
3x-7x-147=0
We add all the numbers together, and all the variables
-4x-147=0
We move all terms containing x to the left, all other terms to the right
-4x=147
x=147/-4
x=-36+3/4
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